Abstract
In this research, the effects of the compaction velocity on the sinterability of the Al–Fe–Cr–Ti powder metallurgy (PM) alloy by high velocity compaction were investigated. The Al–Fe–Cr–Ti alloy powder was compacted with different velocities by high velocity compaction and then sintered under a flow of high pure (99.999 wt%) nitrogen gas. Results indicated that both the sintered density and mechanical properties increased with increasing compaction velocity. By increasing the compaction velocity, the shrinkage of the sintered samples decreased. A maximum sintered density of 2.85 gcm−3 (relative density is 98%) was obtained when the compaction velocity was 9.4 ms−1. The radial and axial shrinkage were controlled to less than 1% at a compaction velocity of 9.4 ms−1. At a compaction velocity of 9.4 ms−1, sintered compacts with an ultimate tensile strength of 222 MPa and a yield strength of 160 MPa were achieved. The maximum elongation was observed to be 2.6%. The enhanced tensile properties of the Al–Fe–Cr–Ti alloy were mainly due to particle boundary strengthening.
Highlights
As energy shortages and environmental pollution become increasingly serious, there is an increasing desire for lightweight materials that can provide energy savings and environmental protection in the automobile industry
The green density and sintered density increased with increasing compaction velocity, which was in agreement with the results reported by Showaiter [10]
Rapid impact ofinhigh compaction only contributes to an increased green density
Summary
As energy shortages and environmental pollution become increasingly serious, there is an increasing desire for lightweight materials that can provide energy savings and environmental protection in the automobile industry. The field of aluminum PM is of particular interest, as the implementation of this technology to produce vehicle components could offer a combination of weight savings because of the low density of aluminum and material savings via aluminum PM near net shape processing attributes [3]. The aluminum PM has an advantage in subsequent processing, for example, in rust protection and demagnetization fields. Press-and-sinter aluminum PM is an ever-growing industry because of the cost savings associated with its high production rates and net shape capabilities coupled with the advantageous strength-to-weight ratio inherent to aluminum alloys [4]
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